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According to law 3, "after a few hours of contact, matter in contact with inverse matter burns." So, when he eats a pomegranate from her world, he should soon be dead...the inverse matter of the fruit should burn up inside him, cooking his stomach/intestines.
And how on Earth is her being pregnant going to make her immune to the laws of double gravity??? LOL (I like the movie...the illogic of it bothers me!)